Tool



TOOL

Filed Nov. 29, 193'?I 2 Sheets-Sheet 1 www QS. WN. IIL .H Y QM. Wn QM.ww .www 89037 $1/ @MJ S uw S mw 1 NNI/ n l .W r/V/ u w c R GNN QN S1 f ENNN @QN QN NW. NW Q Ng www Sw ma Nw SN QN www wmv R. TEMPLE. JR2,213,435

- TooL Filed Nav. 29, 1957 l 2 Sheets-Sheet 2 m5 M35 www NHT WQ k @N wwwNHVM www QQ Y BY UbW/mdw v M ATTORNEY@ WITNESSES.-

Patented Sept. 3, 1940 16 Claims.

This invention relates to velocity power tools wherein a die, piercingpin or like element is driven by detonated explosive means to performuseful work and is particularly concerned with tools of this characteradapted for use in or out of water and for facilitating ship repair asby the removal of rivets or the driving of connector elements throughsuperimposed metal plates.

Velocity power tools of the type described have been provided heretoforebut these have been open to certain objections. Often such tools can notreadily be used or reloaded under water and, moreover, they have notbeen constructed to carry the explosive forces and the stresses on theparts of the apparatus directly to the stock or handle thereof. Further,I have found that known tools may on occasions be inadvertently iiredwith the attendant danger of injury to the operator, or persons orproperty near-by. Perhaps the best explosively operated tools knowntoday and the only ones which have had any widespread use are thosedisclosed in my fathers Patents Nos. 1,365,869 and 1,365,870. Thesetools have been proven to be quite satisfactory in use.

However, my present invention is concerned with further improvements tothe apparatus disclosed in my 'fathers patents.

It is the general object of my invention to 3o avoid and overcome theabove and other diiiiculties of and objections to certain known types of velocity power tools operated by detonated explosive charges and thisis accomplished by the provision of improved tools which can not beaccidentally fired, which are relatively lightreadily operated andreloaded both in and out of water.

Another object of my invention is to provide an improved explosivelyoperated tool in which the forces of the powder charge when detonatedare absorbed directly by the stock and handle of the apparatus.

-Another object of the invention is the provision of an improved tool ofthe character described, which is capable of knocking out rivets andwhich can be4 readily operated and reloaded under water.

The foregoing and other objectsof my invention are achieved by theprovision of an explosively actuated tool including a stock, a firingpin adapted to be xedly held in the stock, a barrel slidably carried inthe stock, a projectile tool received in the barrel, and a powder chargeand detonator behind the tool and the barrel. The barrel is adapted tobe moved back into the stock to engage the ring pin and the detonatorand to` simultaneously engage the inner end of the barrel with the stockso that the back-re of the detonated m powder charge is carried directlyto the stock.

weight but strong and rugged, and which can be Means are included in thecombination for locking the barrel positively in its outermost positionand these means may include other nfeans for repositioning the ring pinso that the apparatus can not accidentally be red. I further prefer-'ably include in the combination a barrel carrier in the stock andsurrounding the firing pin, and

quickly releasable means for securing the barrel and barrel carriertogether whereby reloading of the apparatus is facilitated both in andout of Water. I have discovered further that by shaping the projectiletool in the form of a. punch I am able to knock out instantaneously andquietly either flat-head, round-head or countersunk rivets by drivingthe punch through the axis of the rivet to punch out the stem.

Fora better understanding of my invention reference should be had to theaccompanying drawings in which Fig. l is a longitudinal cross-sectionalview of one embodiment of my invention; Fig. 2v is a view similar toFig. 1 but with only portions of the apparatus being shown in sectionand illustrates another embodiment of my invention; Fig. 3 is a viewsimilar to Figs. 1 and 2 and shows still another form of my invention;and Figs. 4, 5 and 6 are transverse cross-sectional views taken on linesZIV-IV, V--V, and VI-VI, respectively, of Fig. 3.

While the principles of my invention can be used broadly to construct avariety of tools capable of use in many relations, they are particularlybenecial in the manufacture of tools of the driver type in which aprojectile tool, such as a punch, die, pointed pin, or the like isadapted to be driven with high force and velocity against work, such assuperimposed plates, positioned against the end of the apparatus. Hencemy invention will be described in conjunction with driver types of toolsand has been so illustrated.

Referring particularly to Fig. 1, the numeral l0 indicates generally astock having a longitudinal bore i2 therethrough and a handle i4 securedto the end of the stock. The end of the stock l0 opposite the handle .Itis preferably formed of an enlarged external diameter to which` issecured, as by complementary threads l5, a barrel guard i8 which forms'1n effect a continua* tion of *he stock illl; The barrel guard i' maybe made integral with the stock l0 but this is not preferred inasmuch asthe construction,

assembly and repair of the parts is greatly facilr itated by thetwo-part construction described.

Slidably received in the bore l2 of the stock i0 is a barrel'carrier 2-0which is normally urged by a helical compression spring 22 outwardiy othe stock l0. A plug 24 closes the end of the bore i2 of the stock l0adjacent the handie id and likewise serves to support a firing pin 2Baxially of the bore I2, which pin extends into a longitudinal aperture28 provided in the barrel carrier 20. The barrel carrier 20 is formed ofan enlarged external diameter at its end remote from the spring 22 andhas secured thereto a carrier retainer 30. vThis may be accomplished asillustrated in the drawing, by complementary threads 32 and lockingscrews 34.

The carrier retainer 30 is provided with longitudinally extendinggrooves 36 which are open at the carrier end to the inside of the guardI8 and which extend at their other ends into communication with holes 38drilled at circumferentially spaced points into the end of the barrelguard I8. The carrier retainer 30 has sliding engagement with the innersurface 40 of the barrel guard I8, as will be evident from. thedrawings. The end of the barrel guard I8 adjacent the holes 38 is formedwith an internal flange 42 which retains the barrel carrier 20 and thecarrierretainer 30 in the barrel guard by engagement of the carrierretainer 30 with the flange.

A barrel, indicated as a whole by the numeral 48, includes an internallythreaded end 50 adapted to be screwed over the threaded end of thebarrel carrier r20, as is illustrated in the drawings so that the barrelcarrier 20 in effect forms a continuation of the barrel. The end 50 ofthe barrel slides within the iiange 42 of the barrel guard and withinthe carrier retainer 30 so thata readily releasable threaded connectionis provided between the barrel and the barrel carrier 20. The barrel 48is formed with a bore 52 which receives a cup 54 carrying a projectiletool, such asa pointed pin 56 having a threaded backportion58. The pin56 is secured to the cup 54 by a threaded rod 60 which also secures thecup to a primer block 62 with an interspaced cartridge sealing washer 64serving to seal a body of explosive powder 66 within the cup 54. The-rod60 is preferably formed with a center portion 6I of reduced diameter sothat the rod breaks in the operation of the apparatus-as hereinaiterdescribed.

As illustrated in the drawings, the primer block 62 and sealing washer64 are of greater over-al1 diameter than the cup 54 and engage with ashoulder 68 formed in the barrel. A ilash slot 'I0 in the threaded rod60 connects the primer cap 'I2 of the primer block with the powder 66 inthe cup 54. The entire cartridge assembly is normally held in place inthe barrel 48 by a breech nut 'I4 threaded to removably fit within thethreaded end 50 ofthe barrel. The breech nut I4 includes a transversewrench receiving slot 'I6 which permits ythe introduction of the end ofthe firing pin 26 into a longitudinal aperture 'I8 in the breech nut sothat the iiring pin can strike the primer cap 12.

The end of the barrel 48 opposite to the breech is externally threadedand receives a muzzle cap 80 having a longitudinalv bore 82 and anenlarged bore 84 terminating in a shoulder 86. The bore 84 receives anarresting block 88 which engages with the shoulder 86 and whichfunctions to clamp a muzzle sealing disc 90 of relatively soft metal,such as copper, against the end of the barrel 48. The arresting block 80is formed with a reduced bore 92 and associated shoulder which, in theoperation of the apparatus, engages with the normal operation of thepiercing pin 66 since the centering plug is made of relatively soft,easily displaced metal or if. made of harder metal is made relativelythin.

Incorporated with my improved apparatus just described are means forpositively locking the barrel carrier 20 in its outermost position andin the embodiment of my invention illustrated these means include a ringextending around the stock I0 and secured in position by a collar |02.The internal diameter of the ring I 00 is slightly greater than theexternal diameter of the stock so that it can be moved in a. radialdirection with respect to the stock. Normally the ring |00 is held toone side of the stock I0 as by compression spring |04 having an endreceived in a suitable recess inthe stock and positioned indiametricallyopposite relation to a pin |06 secured to the ring |00 and extendingthrough a radial hole in the stock`I0. Pin |06 is received at itsradially inner end in a recess |08 formed in the barrel carrier 20. Thebarrel carrier 20 is further provided with a longitudinal groove IIO inalignment with the recess |08 but of less depth than the recess.

Completing my improved apparatus are radial apertures II2 in the stockI0 adjacent the handle I4 to permit the escape of liquid Within thestock and between the plug 24 and the barrel carrier 20. Likewise I formthe carrier retainer 30 with radial apertures I I4 to permit the escapeof any liquid from between the end 50 of the barrel and the barrelcarrier 20 or the retaining the barrel carrier 20 is in its outermostposi-- tion, the end 50 of the barrel 48 is slipped in the flange 42 ofthe barrel guard I8 and within the carrier retainer 30 until itsinternally threaded end is in engagement with the threaded end of thebarrel carrier. Relative rotary movement of the parts now eiects aquickly releasable but positive and tight connection between the barrel48 and the barrel carrier 20. With the parts in this position the toolcan be handled substantially as desired and can not accidentally befired.`

When it is desired to operatethe apparatus, the end of the barrelcarrying the muzzle cap l0 is positioned with respect to the work and,if the centering plug 94 is used, so that the plug aligns the apparatusand the work. Now the ring |00 adjacent the spring |04 is pressedradially to move the locking pin |06 out of the recess |08, and pressureon the handle I4 moves the locking pin |06 out into the groove IIO ofthe barrel carrier 20 and the barrel carrier moves back into the bore I2of the stock I0 against the action of the spring 22. Continued movementof the handle toward the barrel moves the barrel guard I8 over thebarrel 48 and brings the firing pin 26 into detonating engagement withthe primer cap 12. This causes the explosion of the powder charge S6which, after a predetermined force has been reached by the charge,breaks the threaded rod 60 near its weakened portion 6I and moves thecup 54 and .pin 56 rapidly and with great force through the barrel 48 topiercethe sealing disc 90 and the centering plug Si so that the pin isdriven into the work at least up to the threaded portion 58. The cup 5iengages with the shoulder of the arresting block 88 and the pin 56 pullsloose from the short threaded end of the threaded rod 60.

At the time of firing, the barrel carrier 20 is back in the barrel guardI8 and is substantially in engaging relation with the end of the stock|0. Specifically, the surface 20a. of the barrel carrier 20 engages withthe surface Illa of the end of the stock I0. Thus the kick backward ofthe barrel 48 upon the forward movement of the cup 5d and pin 55 isdirectly carried to the barrel carrier 20 and to the stock I 0 and intothe handle It held by the operator. After ring, the handle I@ and stockI0 are moved away from the work and the spring 22 forces the barrelcarrier 20 and the barrel iiil outwardly of the stock I0 and barrelguard I8 until the end of the carrier retai`ner strikes the flange 42,at which time the 'parts are in the original full line position ex'ceptthat the pin 56 has been red out of the barrel. At this time the pin |06drops into the recess |08 and the barrel 48 can be unscrewed.

Ordinarily in under-water operation when it is desired to re theapparatus a second time, a complete new barrel with the cartridgeassembly therein is screwed into place on the barrel carrier. However,in operation above water a new cartridge assembly can be substituted forthe discharged cartridge while making use of the same barrel and thiscan be accomplished by removal of the barrel from its holder and theremoval of the muzzle cap 80 from -the barrel` The sealing washer 90 isordinarily replaced although this is not necessary for use of the toolabove water. The holes |I2,- 38 and IILl permit the assembly andoperation of the parts in or out of water or other liquid withoutjamming, as will be recognized, and in operation in water the parts ofthe apparatus which would be aiected by water are carefully sealedagainst the entrance of water so that the apparatus is particularlyadapted for ready and repeated operation below the surface of water.

In the embodiment of my invention illustrated in Fig. 2 many of theparts are similar to those illustrated in Fig. 1 and described above indetail, and where this is true the parts have been indicated by the samenumerals except that the suffix a has been added.

One Vimportant difference in the apparatus of Fig. 2 is that the firingpin 26a is secured to a plug |20 which plug is slidably mounted in theend of the stock |0a adjacent the handle Ia of the apparatus. The plug|20 is normally in the full line position illustrated and is heldagainst movement out of the stock I0a by a bell crank |22 pivotallymounted as at |24 upon a pair of lugs |26 provided on the handle Ida.With the `plug |20 in the full line position shown, the ring pin 26a isslightly retracted so that the parts can never be moved into detonatingrelation. The bell crank |22 is provided with a ring |28 at the end ofits arm remote from the plug |20 so that the operator can readily stickhis :linger through the ring and move the bell crank I 22 from thefull-line position shown to the dotted-line position, which moves theplug |20 into the stock I0a a short distance and thus carries the iiringpin 25a forward to operating position.

Instead of employing the cartridge assembly illustrated and described inconjunction with Fig.

1, the embodiment of my invention shown in Fig. 2 employs, a cartridgeassembly of the type'shcwn in my Patent No. 2,064,503. This assemblyincludes a cylindrical member |30 slidably received in the breechportion of the barrel 28a. and held against movement out of the breechportionl and through the barrel by cooperating shoulders 68a.. Thecylindrical member |30 is formed in effect of two parts, namely a cup orpiston and a breech portion. These parts may be made separately andconnected together in any way so that the breech portion removablyreceives a blank cartridge |32 and the 'piston or cup portion carries atool, such as a punch |36. Upon detonation of the blank cartridge |32the breech portion of the cylindrical member |30 remains fixed in thebarrel 48a between the shoulder 68a and the end of the barrel carrier20a. The cup portion of the cylindrical member is retained in engagementwith the breech portion until the force of the detonated blank cartridgeexceeds a predetermined maximum, at which time the full force of thepowder charge is realized and the cup portion of the cylindrical memberis moved away from the breech portion.

While the exact type of connection between the cup portion and thebreech portion of the cylindrical member |30 can take a variety of formsto obtain the function just described, it is convenient to make thecylindrical member |30 from an integral piece and to provide a groove|36 or other zone of weakness between the cup portion and the breechportion of the cylindrical member. `The thickness of the metal beneaththe groove |36 controls the breaking force required to separate the cupportion and the breech portion of the cylindrical member |30.

The muzzle cap a of the apparatus is removably secured as bycomplementary threads to the end of the barrel 48a and an arrestingblock 88a is secured between the end of the barrel and the muzzle cap.Sealing discs a and 90b are clamped at the ends of the arresting block88a so as to prevent the entrance of liquid into the barrel 08a when theapparatus is used under water.

The embodiment of my invention just described is particularly adapted toknock out rivets or perform similar operations under water to facilitateship repair or the like. Thus, I have specifically shown in the drawingsa plurality of plates |80 secured together by a rivet IZ of any knowntype including either countersunk, i'lat or round heads. In theoperation of the apparatus, which is similar to that above described andwhich will not be repeated in detail, the axis of the apparatus isaligned with the axis of the rivet |02 with the muzzle cap 80a againstthe rivet head. The punch |33 is of a size slightly less than thediameter of the rivet body and in the operation of the apparatus isdriven with high force and velocity against the rivet head to punch thestem of the rivet out of the rivet hole and release the plates |00.

In the punching operation the cup portion of the cylindrical member |30engages with `the arresting block 88a to prevent the escape of gasesfrom within the barrel @0a and thus eliminate noise and shock in the useof the apparatus. The relatively short threaded connection between thepunch |32 and the cylindrical member |30 is severed, usually bystripping of the thread, to permit the above-stated operation of thepunch.

, The repeated use and reloading of the apparatus in or out of water isfacilitated by changing the complete barrel although it should beunderstood that in use out of water the same barrel can be used over andover again by providing a new cartridge assembly and sealing discs ifdesired. In this connection it should further be appreciated that withthe apparatus of either the form shown in Fig. 1 or the form shown inFig. 2 I am able to use a punch, die, pointed pin or other shapedprojectile in the same barrel and that barrels carrying different types,sizes and weights of projectiles and differentrtypes or sizes ofcartridges or powder charges are readily interchangeable with each otherand the tool can be adapted to perform work of any desired character.

The form of my invention shown in Figs. 3 toV 6 differs from thoseillustrated in Figs. 1 and 2 in that the apparatus of Figs. 3 to 6 isnot adapted, ordinarily, for use under water but is most advantageouslyemployed above water where it can be readily reloaded in the field in aminimum of time and without special tools. Having particular referenceto Figs, 3 to 6 the numeral |50 indicates a handle to which is secured afiring pin |52 by bolt |54. The bolt |54 likewise secures a disc |56 tothe handle which is externally threaded to engage with the internalthreaded end of a stock |58. A screw |60 may be provided to secure thedisc |56 and stock |58 together at all times and a circular flange |62may be provided on the handle |50 to receive the end of the stock |58.The stock |58 is of tubular shape near the handle |50 as best seen inFig. 6, but is provided adjacent its end remote fromjthe handle with alongitudinal slot or opening 64 illustrated in Figs. 3 and 5 whichopening extends somewhat more than half the length of the stock andwhich is of such width as to receive a barrel as hereinafter described.

Slidably received in the stock |58 is a tube or barrel carrier |66 towhich is secured a breech block |68 also adapted to be slidably receivedin the stock |58. The breech block and tube have been illustrated asbeing connected together by complementary threads which are held againstmovement lapart by a screw |10.l The breech block |68 is formed with acup-shaped cavity |12 which receives one end of a coil compressionspring |14 having its other end surrounding the firing pin |52. It willbe recognized that the spring |14 normally pushes the tube |66 andbreech block |68 outwardly of the stock |58. The outward movement of thetube |66 in the stock |58, as iniiuenced by the spring |14, is limitedby a pin |16 secured to the tube and received in a slot |18 whichextends circumferentially of the stock through approximately 180degrees. At one end of the circumferential slot |18 the stock |58 isformed with a longitudinally extending slot |80 which, as shown in Fig.3, is of such length as to receive the pin |16 and permit movement ofthe tube 66 inwardly of the stock |58 until the firing pin |52 is forcedinto operating relation with the breech block |68 as hereinafterdescribed. At the other end of the circumferential slot |18 a shortlongitudinal slot |82 is provided which extends in the stock only in adirection away from the handle |50. When the pin |16 is received in theslot |82, as shown in Fig. 5, the apparatus can not be operated sincethe tube 66 can not be pushed back into the stock |58 because the pin|16 engages with the end of the slot |82 adjacent the end of thecircumferential slot |18. The slots |18, |80 and |82 are covered by aU-shaped metal shell |83 which is secured tightly around the stock |58so that an operators fingers cannot be pinched in the slot and so theslots are kept free of foreign matter.

The tube |66 like the stock |58 is formed with a longitudinal slot oropening |86 which is of the same transverse size as the opening |64. Theopenings |64 and |86 are of a, width substantially equal to the internaldiameter of the tube |66 and permit the lateral movement into the tube|66 of a barrel |88 formedwith a longitudinal bore |90 and provided atone end with a breech which removably receives a working element`|92 andexplosive means |94 including a detonator portion adapted to registerwith the breeclr block |68. The working element, explosive means, anddetonator constitute preferably a unitary element which can be readilydropped into the breech portion of the barrel and which can be pluckedout after ring simply by hand or with the aid of ordinary tools, such asa pair of pliers.

The end of the barrel |88 opposite the breegh and a 'satisfactory mannerof accomplishing the desired result is to provide internal threads atthe end of the tube and to externally' thread the arresting block-202. Aknurled knob 206 is secured to a projecting boss 208 on the arrestingblock and is provided with a iiange 2|0 extending slidably over the endof the tube |66. Thus rotation of the knob 206 moves the arresting block202 in and out of the end of the tube |66. to tighten the barrel |88 inplace in the tube or to permit it to be removed laterally from the tubethrough the openings 86 and 64.

In the operation of this embodiment of my |66 and with the openings |64and I 86 in alignment the breech end of the barrel |88 is droppedthrough the aligned openings and substantially into engagement with thebreech block |68. The muzzle end ofthe barrel is then moved laterallythrough the openings into position in axial alignment with' thearresting block 202. The knob 206 is now tightened to clamp thearresting block 202 against the muzzle end of the barrel |88 and toforce the breech end of the barrel and particularly the detonatorportion of the explosive means tightly into engagement with the breechblock |68.

The barrel, the working element and the explosive means are now securelylocked in the tube |66 but with the openings |64 and |86 in alignmentthe apparatus can not be fired since the pin |16 prevents movement ofthe tube |66 towards the handle end of the stock |58. 'I'hus afterloading as just described the tube |66 and barrel |88 must be movedthrough k180 degrees with respect to the stock |58 before the apparatuscan be fired. In this movement of the parts the operator grips thehandle |50 with one hand and with the other holds the tube |66 so thatby combined movement of his hands together and a relative rotarymovement thereof the pin |18 is moved out of the short slot |82 where ithas been held by the spring |14, circumferentially through the slot |18and into the short portion of the slot |80 most remote from the handle|50. In this position the opening |68 will be diametrically opposite theopening |86 as will be understood.

The apparatus is now. readyto be red which can be readily accomplishedby engaging the arresting block 208 with the work and depressing thehandle |50 towards the work. In this depressing movement of the handlethe tube |66l slides back in the stock |58 toward the handle |50 withthe pin |16 sliding .in the long slot |80 until the firing pin |52strikes the detonator portion of explosive means |88 to detonate theexplosive. The detonated explosive then drives the working element |82usually with the aid of a piston or cup forwardly through the bore |80of the barrel |88 and through the bore 204 of the arresting block 202and into the Work to per.- form the desired function. The arrestingblock 202 stops the cup or piston of the explosive means and preventsthe escape of gases so that the noise and flame usually attending anexplosion is eliminated. Once the apparatus has been fired the pressureon the handle A|50 is released and the spring |14 forces the breechblock and tube outwardly of the stock |58. Relative rotary movement ofthe tube |86 and stock |58 through 180 degrees realigns the openings|88. and |86. Ro-

tary movement of the knob 206 away from the barrel |88 releases it sothat the barrel can be tipped sideways out of the aligned openings. Thedischarged cartridge element is then removed from the barrel and theapparatus is again reloaded as above described and the operation isrepeated. It will be recognized that reloading is relatively simple andfast and that a large number of desired working operations can beperformed by a single operator in a short time.

From the foregoing it will be recognized that the objects of myinvention have been achieved by the provision of relatively simple butsturdy and long-wearing velocity power tools of., the driver type whichare capable of ready and continued use in or out of water. The stressesof operation are absorbed directly by the stock and handle of theapparatus and one or more positively acting safety mechanisms areincorporated in the structure to completely prevent accidental operationthereof.

Although I have speciiically illustrated and described two embodimentsof my invention, it should be understood that my invention is notlimited thereto or thereby but is defined in the appended claims.

I claim:

1. In combination, a barrel, a breech on the barrel adapted to receive aprojectile and an explosive charge, a barrel carrier removably carryingthe barrel, a breech block on the carrier closing the breech end of thebarrel when carrying the barrel, a stock slidably supporting the barrelcarrier, a firing pin supported in the stock, and resilient meansyieldably holding the barrel carrier outwardly of the end of the stockcarrying the firing pin but allowing the carrier to be moved into thestock to force the iiring pin through the breech block.

2. An explosively actuated tool including a stock, a tiring pinassociated with the stock, a barrel slidably carried in the stock andhaving a breech portion adapted to receive e\ powder charge, said barrelbeing movable back into the stock to engage the breech portion of thebarrel with the stock, said flring pin being positioned to be inoperative relation with the breech portion of the barrel only when thebreech portion is back against the stock, means for locking the barrelin its outermost position, a barrel carrier in the stock and surroundingthe iiring pin, and quickly releasable means for securing the barrel andbarrel carrier together.

3. An explosively actuated tool including a stock, a firing pin adaptedto be xedly held in the stock, a barrel slidably carried in the stockand having a breech portion at its inner end, said barrel being adaptedto be moved back into the stock to position the flringpin in the breechportion and simultaneously engage the inner end of the barrel with thestock, means for locking the barrel in its outermost position, a barrelcarrier in the stock and surrounding the firing pin, and quicklyreleasable means for securing the barrel and barrel carrier together.

4. An explosively actuated tool including a stock, a firing pin adaptedto be xedly held in 'the stock, manually operable means for quickly ofthe barrel with the stock, means for locking,

the barrel in its outermost position, a barrel carrier inthe stock andsurrounding the firing pin, and quickly releasable means for securingthe barrel and barrel carrier together.

5. An explosively actuated tool including a stock, a ring pin adapted tobe iixedly held in the stock, a barrel slidably carried in the stock andhaving a breech portion at its inner end, said barrel being adapted tobe moved back into the stock to position the iiring pin in firingrelation with the breech portion and simultaneously to engage the innerend of the barrel with the stock, and a removable barrel guard securedto the stock and extending over the barrel in sliding relationtherewith.

6. An explosively actuated tool including a stock, a ring pin adapted tobe xedly held in the stock, a barrel slidably carried in the stock andhaving a breech portion at its inner end, said barrel being adapted tobe moved back into'the stock to position the firing pin in firingrelationwith the breech portion, a ring around the stock oi greaterinternal diameter than the outside of the stock, means holding the Aringagainst endw'ise movement on the stock, a pin secured to the ring andextending through the stock into releasable engagement with a recess onthe barrel, and resilient means on the ring holding the pin normally inengagement with the recess.

7. An explosively actuated tool including a stock, a firing pinassociated with the stock, a barrel carrier slidably mounted in thestock and surrounding the firing pin, a barrel, quickly releasable meansfor securing the barrel and barrel carrier together, and means normallyholding the barrel carrier outwardly of one end of the stock butallowing the barrel carrier to be moved back into the stock to positionthe end of the barrel adjacent the iirlng pin.

8. An explosively actuated tool comprising a stock having a longitudinalbore therethrough, a

handle Secured to the stock, a barrel guard secured to an end of thestools and having a longln tudinal bore, a barrel slidably receivedinthe' bore of the barrel guard, a barrel carrier sldably received in thebore of the stock and having a threaded end adapted to be threaded inbreech block relation with the end of the barrel, a firing pin extendingaxially through the bore of the stock and through an axial bore in thebarrel carrier and secured at one end of the stock. adjacent the handle,and resilient means urging the barrel carrier outwardly of the stock.

9. An explosively actuated tool comprising a stock having a longitudinalbore therethrough, a handle secured to one end of the stock, a barrelguard secured to the other end of the stock and having a longitudinalbore, a barrel slidably received in the bore of the barrel guard, abarrel carrier slidably received in the bore of the stock and having anend adapted to be removably secured in breech block relation with theend of the barrel, a firing pin 'extending axially through the bore ofthe stoel: and through an axial bore in the barrel carrier and securedat one end of the stock adjacent the handle, and a centering plugassociated with and closing'the end 'of the muzzle end of the barrel.

10. An explosively actuated tool comprising a stock having alongitudinal bore therethrough, a handle secured to one end of thestock, a barrel guard secured to the other end of the stock and having alongitudinal bore, a barrel slidably received in the bore of the barrelguard., a barrel carrier slidably received in the bore of the stock andhaving a threaded end adapted to be threaded in breech block relationWith the end of the barrel, a nring pin extending axially through thebore of the stock and through an axial bore in the barrel carrier andsecured at one end of the stock adjacent the handle, resilient meansurging the barrel carrier outwardly of the stock, a manually releasablelock positively holding the'bar- .rel carrier at the outermost portionof its travel in the stoclr, and a centering plug associated with andclosing the end of the muzzle of the barrel.

1l. An explosively actuated tool comprising a stock having -alongitudinal bore, a firing ein mounted at one end of the stock, a tubeslidably mounted in the stock, a breech block closing the end of thetube adjacent the firing pin, resilient means normally but yieldablyholding the breech block away from the firing pin, a barrel removablycarried by the tube, a breech on the barrel adjacent the end next to thebreech block, an arresting block removably and adjustably secured to theend or" the tube remote from the firing pin and adapted to clamp thebarrel in the tube against the breech block, said tube and stock havinglateral openings formed therein to permit the introduction or removalor" the barrel laterw ally when the arresting block is backed oli, andmeans connecting the tube and the stock whereby the lateral openingsthereof can be moved into and out of register and the tube moved backinto firing position only when. the lateral openings are not inregister.

l2. An explosively actuated tool comprising a stock having alongitudinal bore, a iiring pin mounted at one end of the stools, a tubeslidably mounted in the stock, a breech block: closing the end 'of thetube adjacent the silient means normally but yleldably hoir breech blockaway from ythe firing p' removably received by the tube, means andadjustably secured to the end c'4 the remote from the tiring pin andadaptedt'o cla the barrel in the tube against the breech blc K. saidtube and stock having lateral openings formed therein to permit theintroduction or re moval of the barrel laterally when the arresting sblock is backed olf, and means connecting'the tube and the stock wherebythe lateral openings thereof can be moved into and out of register'andthe tube moved back into firing position only` when the lateral openingsare not in registen A 13. An explosively actuated tool comprising atube, a breech block closing one end of the a barrel removably receivedby the tube, a deech y on the barrel adjacent the end next to thebreechV block, means adjustably secured to tl'iefendor" the tube remotefrom the breech of the 'b'frrel and adapted to clampthe barrel *1against the breech block, said tubehat eral opening formed therein topermit thai .ao# j duction or removal of the barrel laterally when theadjustable means secured to the tube is backed off, and mechanism forring an explosive charge carried by the barrel and capable-of operationonly after complete loading of the tool. j 14. An explosivelyactuatedtcol comprising tube, a breech block closing one end of thetube, a barrel removably received by the tube, a breech on 'the barreladjacent the end next to the' breech block, and means adjustably securedto the other end of the tube and adapted to clamp the barrel in 'thetube and longitudinally against the block, said tube having a lateralopening formed therein to permit the introduction or removal the barrellaterally when the adjustable i secured to the tube-is backed 15. AnexplosivelyI actuated tool comprising a stock having a longitudinalbore, a tube mounted in the stock, a breech block closing one end-of thetube, a barrel removably receivedby the tube, a breech on the barreladjacent the end rie-:t to the breech block, means removably and ad-`iustably secured to the other end of the tube and adapted to clamp thebarrel in the against the breech block, said tube having lateralopenings formed therein to pe the introduction or removal ofthe barrellat ally when the securing means is backed off, mech anism fordetonating an explosivecharge carried in the breech of the barrel, andmeans tor operating the detonating mechanism only plete loading of thetool.

i6. An explosively actuated tool cornprisirf7 stock having alongitudinal bore, a tube mounte in the stock, a breech block closingone the tube, a barrel removably received by the tu a breech on thebarrel adjacent the end next the breech block, and means removably andadjustably secured to the other end of the f and adapted to clamp thebarrel n against the breech block, said t` having lateral openingsformed th the introduction or removal of '2 orally when the securingmeans is

